which is different from others

The answer is nitrogen.

All of carbon monoxide, hydrogen and methane can burn. On the other hand, nitrogen cannot burn.

2009-09-01 20:25:14 補充：
"Containing oxygen" is NOT a "property".
「不含氧」並非一項「性質」。

This is not a good question . Answer #1 is Nirogen . You say nitorgen will not burn but how about N2 + 2O2-----> NO2 during thunder storm . So all can react with oxygen to form respective oxides ! #2 is Carbon monoxide is not because it contains oxygen but rather it can combine with oxygen easily to form carbon dioxide . It is a very poisoneous gas . When it is absorbed in blood will make the hemoglobin functionless that one will die soon !

Ans for Carbon monoxide:
Carbon monoxide contain oxygen while other do not